I was just thinking the same thing:
One man and his press:
1 mug = 180 secs cooking time
180 seconds = 3 mins
5,000 x 3 = 15,000 mins.
15,000 divided by 60 = 250 hours
250 hours = 10 days + 10 hours
And that's not taking into account any time to prepare, print, change mugs, drink, eat .................... and sleep!
Of course, with a couple of mug presses this could be halved but it does seem a daunting task!